Haganai (はがない), short for Boku wa Tomodachi ga Sukunai (僕は友達が少ない, lit. "I Don't Have Many Friends"), is a Japanese light novel series written by Yomi Hirasaka, illustrated by Buriki, and published by Media Factory. It has been given several manga adaptations; the first incarnation, its title and basic plot unchanged, began serialization in 2010; it was written and illustrated by Itachi and published in Monthly Comic Alive. A retelling of the series, written by Misaki Harukawa and illustrated by Shuichi Taguchi and called Boku wa Tomodachi ga Sukunai+ was published in Jump SQ.19. A 12-episode anime adaptation by AIC Build aired in Japan between October and December 2011. An original video animation episode was released on September 26, 2012. A second anime season, Haganai NEXT, aired between January and March 2013. A live-action film adaptation was released on February 1, 2014.

Hasegawa Kodaka is a recent transfer student to St. Chronica's Academy, a Catholic high school. As with every other school he has ever attended, he finds it difficult to make friends there because of his naturally-blond hair (inherited from his deceased English mother) and fierce-looking eyes, which make him look like a dangerous "yankee" to his prejudiced schoolmates.

One day, Kodaka accidentally comes across the equally solitary and very abrasive Yozora Mikazuki while she converses with her imaginary friend Tomo. Realizing that neither of them have any social lives, they decide that the best way to improve their situation is to form a club – the Neighbor's Club – precisely intended to make friends and learn social skills.
Five other members soon join the club, starting with the school's well-connected but arrogant idol Sena Kashiwazaki, who has no female friends of her own because of their jealousy over her many male admirers. The next to join is Yukimura Kusunoki, a feminine underclassman of Kodaka's who rather idealizes him and follows him in the hope that it will teach him to become manlier. Maria Takayama is a 10-year-old genius teacher and nun at the academy whom Yozora recruits to become the club adviser. Rika Shiguma is an underclassman and well-known scientific genius with fujoshi tendencies who joins the club after Kodaka rescues her from a laboratory accident. Finally, Kodaka's younger sister Kobato is in St. Chronica's middle school division and is a fan of Gothic anime.